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Messages - Josh

Pages: [1] 2 3 4 5 6 7 8 9 ... 272
1
Equipment / Re: Mystery 1960's B&W Balun?
« on: August 22, 2020, 1939 UTC »
I don't think these have any transformative circuit, they just go from balanced to unbalanced lines. Could always take it apart to see. As such it might be able to take a good bit of power. Now if it was one of the bw baluns for the receive only or qrp version of their folded dipole, do not tx into it with more than a few watts.

2
It turns out that many LTE carriers reuse the same keystream when two calls are made within a single radio connection. An attacker can then record an encrypted conversation, then immediately call the victim after that conversation. The attacker can now access the encrypted keystream, and as the keystream is identical to the first conversation, the first conversation can now be decoded.
https://www.rtl-sdr.com/eavesdropping-on-lte-calls-with-a-usrp-software-defined-radio/

3
Huh? / Re: Papilio Polyxenes
« on: August 20, 2020, 1810 UTC »
Seen way more of the black swallowtails or whatever they're called as opposed to Monarchs.

https://www.youtube.com/watch?v=MMGhw-FJsuI

4
HF Mystery Signals / Re: Need help on multi-tone signal ID
« on: August 20, 2020, 1749 UTC »
You might consider splitting this up into files a bit less than 300mb.

5
Yeah no it's not like the ability to record audio and play it back hasn't been around for ages now, or that anyone would ever dare to do that to bell.

6
I wonder if this was a relay craft, with battles taking place hundreds of miles from the home carrier force and hf hit or miss at that distance, a v/uhf relay would fill the gap.

This was common in the ETO (European Theatre of Operations) where missions over Germany and many other countries of similar distance to England would necessitate a v/uhf relay.

In such cases, a pair of fighters would be sent to orbit offshore northern Europe, providing a radio relay between command and the units over the target with very good success.

A pby would have much longer duration on station than a fighter and provide more comfort and amenities to the crew in this duty, as well as afford the means to recover airmen when possible.

7
10/11 meters / Re: 11 Worldwide Contest
« on: July 18, 2020, 2034 UTC »
Shame to see this disease spread from HAM radio.

8
Huh? / Re: You Were In Radio, When!!!!!!!!
« on: July 15, 2020, 1545 UTC »
Ahhhh the reel to reels. I recall a fine day when a promo was slotted for my show and the jock before me hadn't lined me up with the tape. When you walked into the console you would (or were supposed to) have a pile of paid advertising and promos that were for your slot, and this hour long special from the ryman auditorium was nowhere to be found and I am all alone.

Suddenly the sm shows up and I report to him the tape's not here and is on in 4 minutes, he gets mad and starts running all over the station with veins bulging trying to find it, I find it in the pile to be erased in another room and tell him, he gets even madder and pretty much blames me for everything. I walked over to the console after setting up the tape and slammed the feed from the track that was ota to the special, f the sm in his face, who didn't say a word. I didn't last much longer there, the place was falling apart and continued after I jumped ship, the owners fired pretty much everyone including the sm and started over. There was the finding of inappropriate materials in the booth wastebasket as well as the scandalous use of the station vacuum cleaner on a home carpet that ruined said vacuum, everyone talking about everyone else and on and on insane shit. I was thinking my god this place is worse than high school.

The guy who came on after me said there'd been a few complaints and I was like that's all I needed to hear, I'm out. And he panics and is like whoa wait you gatta give them some time before you jump and I was all like nah bruh I'm out, laids.

You couldn't pay me enough to do that job again.

9
Huh? / Re: You Were In Radio, When!!!!!!!!
« on: July 14, 2020, 1737 UTC »
We had carts for psas and promos/commercials, giant reel to reels from the 40s that were used every day and looked almost new, and a vcr (audio only lol) to record the sat feeds we time slotted. I'd say the station got its moneys worth outta those reel to reels.

10
Not only does propagation delay make an impact but interleaving and/or fec in the signal will also add delays, however minor they may be. S4285, what drm is based on as I recall, has some interleave/fec modes that can cause several seconds of delay.

https://www.etsi.org/deliver/etsi_es/201900_201999/201980/03.02.01_60/es_201980v030201p.pdf.

11
Equipment / Re: Higher highs and lower lows on MW TX antenna
« on: July 14, 2020, 1723 UTC »
Perhaps modulation schemes are different per station?

12
10/11 meters / Re: 11m true free speech in the raw!
« on: July 11, 2020, 1857 UTC »
4 raja an im back quiet

13
General Radio Discussion / Re: Russian Kerosene Powered Radio
« on: July 09, 2020, 1347 UTC »
1000 roentgens per hour never hurt no one.

14
For Sale / Wanted / Barter / Re: Kenwood VC-20 and YK-88A-1
« on: July 09, 2020, 1343 UTC »
If your r5k doesn't have a yk88a, this filter will surely help in situations where a 6kc filter will come in handy. The existing filter is a monolithic type with inherently very poor characteristics for a xtal filter, a yk will be better in every respect save for cost. If I had a r5k and a loose yk88a, they would soon be working together.

15
Utility / Re: 11175 callsigns
« on: July 09, 2020, 1318 UTC »
Ron is a great guy and a real asset to ute monitors for sure.

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